Examine the impact of subject line length on email open rates by testing different variations. Start by comparing short subject lines (under 40 characters) with longer ones (40-70 characters) to determine which performs better within your specific [Industry]. Focus on tailoring the message to the reader’s [Role] while maintaining clarity and relevance. Keep in mind that shorter subject lines may appeal to a mobile audience, while longer ones might work better in more complex or formal contexts. Create a performance analysis report showing which length works best for different [Region]-specific campaigns, and evaluate whether the inclusion of key [Service] terms boosts engagement.